Garlic peel,as the raw material,was modified by loading with zirconium(IV),exhibiting quite good uptaking behaviour for fluoride anion.The adsorption experiments were carried out in batch shaking vessels,and the proce...Garlic peel,as the raw material,was modified by loading with zirconium(IV),exhibiting quite good uptaking behaviour for fluoride anion.The adsorption experiments were carried out in batch shaking vessels,and the process was strongly dependent on the pH value.The adsorption fits Langmuir model well,and the maximum adsorption capacities at equilibrium pH 2 and 6 are evaluated to be 1.10 and 0.89 mol(fluoride)/kg of Zr-loaded garlic peel gel,respectively.The evaluation of effects of coexisting anions such as nitrate,sulfate and phosphate shows that nitrate and sulfate have no negative effect on the adsorption of fluoride,while phosphate has a little effect.Adsorption kinetics of fluoride is well described by pseudo-second-order rate equation,and the corresponding adsorption rate constant is calculated to be 3.25×10?3 g/(mg·min).展开更多
A highly selective ligand exchange type adsorbent was developed for the removal of trace arsenic(V) (As(V)) and phosphate from water. This adsorbent was prepared by loading zirconium(IV) on monophosphonic acid resin. ...A highly selective ligand exchange type adsorbent was developed for the removal of trace arsenic(V) (As(V)) and phosphate from water. This adsorbent was prepared by loading zirconium(IV) on monophosphonic acid resin. This adsorbent was able to remove toxi canions efficiently at wide pH ranges. However, low pH was preferable for maximum breakthrough capacity in an adsorption operation.The effect of a large amount of competing anions such as chloride, bicarbonate, and sulfate on the adsorption systems of As(V) andphosphate anions was investigated. The experimental findings revealed that the As(V) and phosphate uptakes were not affiected by thesecompeting anions despite the enhancement of the breakthrough points and total adsorption. Phosphate anion was slightly preferablethan As(V) in their competitive adsorption by the adsorbent. The adsorbed As(V) and phosphate on the Zr(IV)-loaded resin werequantitatively eluted with 0.1 mol/L sodium hydroxide solution, and the adsorbent was regenerated by 0.5 mol/L sulfuric acid. Duringseveral cycles of adsorption-elution-regeneration operations, no Zr(IV) was detected in the column efluents. Therefore, the Zr(IV)-loaded monophosphonic acid resin is an effective ligand exchange adsorbent for removing trace concentrations of As(V) and phosphatefrom water.展开更多
Three new metal complexes derived from Er(III), Dy(III) and Zr(IV) with 2-aminobenzohydrazide(ABH) were synthesized and characterized by elemental analyses, IR, 1H-NMR, ES-MS and transmission electron microscopy(TEM)....Three new metal complexes derived from Er(III), Dy(III) and Zr(IV) with 2-aminobenzohydrazide(ABH) were synthesized and characterized by elemental analyses, IR, 1H-NMR, ES-MS and transmission electron microscopy(TEM). The morphology and the particle size were determined by TEM. The results showed that the ligand acted as neutral bi-dentate coordinating to the metal ions through the carbonyl oxygen and amidic amino nitrogen. The aromatic amine group remained inert towards coordination. The optical band gap was measured and found to be 3.3, 3.5 and 4.3 e V for Er(III), Dy(III) and Zr(IV), respectively. The optical band gap values indicated a semi-conducting nature of the investigated complexes. The anti-inflammatory and analgesic activities of the tested compounds were determined and compared with standard meloxicam.展开更多
基金Project(11140065) supported by Research Program for Returned Oversea Scholars of China
文摘Garlic peel,as the raw material,was modified by loading with zirconium(IV),exhibiting quite good uptaking behaviour for fluoride anion.The adsorption experiments were carried out in batch shaking vessels,and the process was strongly dependent on the pH value.The adsorption fits Langmuir model well,and the maximum adsorption capacities at equilibrium pH 2 and 6 are evaluated to be 1.10 and 0.89 mol(fluoride)/kg of Zr-loaded garlic peel gel,respectively.The evaluation of effects of coexisting anions such as nitrate,sulfate and phosphate shows that nitrate and sulfate have no negative effect on the adsorption of fluoride,while phosphate has a little effect.Adsorption kinetics of fluoride is well described by pseudo-second-order rate equation,and the corresponding adsorption rate constant is calculated to be 3.25×10?3 g/(mg·min).
文摘A highly selective ligand exchange type adsorbent was developed for the removal of trace arsenic(V) (As(V)) and phosphate from water. This adsorbent was prepared by loading zirconium(IV) on monophosphonic acid resin. This adsorbent was able to remove toxi canions efficiently at wide pH ranges. However, low pH was preferable for maximum breakthrough capacity in an adsorption operation.The effect of a large amount of competing anions such as chloride, bicarbonate, and sulfate on the adsorption systems of As(V) andphosphate anions was investigated. The experimental findings revealed that the As(V) and phosphate uptakes were not affiected by thesecompeting anions despite the enhancement of the breakthrough points and total adsorption. Phosphate anion was slightly preferablethan As(V) in their competitive adsorption by the adsorbent. The adsorbed As(V) and phosphate on the Zr(IV)-loaded resin werequantitatively eluted with 0.1 mol/L sodium hydroxide solution, and the adsorbent was regenerated by 0.5 mol/L sulfuric acid. Duringseveral cycles of adsorption-elution-regeneration operations, no Zr(IV) was detected in the column efluents. Therefore, the Zr(IV)-loaded monophosphonic acid resin is an effective ligand exchange adsorbent for removing trace concentrations of As(V) and phosphatefrom water.
文摘Three new metal complexes derived from Er(III), Dy(III) and Zr(IV) with 2-aminobenzohydrazide(ABH) were synthesized and characterized by elemental analyses, IR, 1H-NMR, ES-MS and transmission electron microscopy(TEM). The morphology and the particle size were determined by TEM. The results showed that the ligand acted as neutral bi-dentate coordinating to the metal ions through the carbonyl oxygen and amidic amino nitrogen. The aromatic amine group remained inert towards coordination. The optical band gap was measured and found to be 3.3, 3.5 and 4.3 e V for Er(III), Dy(III) and Zr(IV), respectively. The optical band gap values indicated a semi-conducting nature of the investigated complexes. The anti-inflammatory and analgesic activities of the tested compounds were determined and compared with standard meloxicam.
